What is the smallest artillery shell? - Quora

Answer (1 of 3): There seems to be a convention to consider anything smaller than 20 mm as small arms, and anything larger than that “artillery” (per Brittanica, anyway), because 20 mm is pretty much the smallest practical size for a “shell”—that is, a hollow projectile containing some sort of ge

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Why did the WWII M4 Sherman tank have such a small calibre and short-barreled main cannon? - Quora

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What is heavy artillery in regards to guns and firearms? - Quora

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Why didn't the artillery shoot at the inside of the trenches during WW1? - Quora